Derivative Financial Instruments and Hedging Activities (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Dec. 31, 2011
Derivatives, Fair Value [Line Items]
Debt denominated in foreign currency designated as non-derivative net investment hedging instrument	$ 126	$ 129
Percentage of intercompany balance sheet exposure	100.00%
Other current assets [Member]
Derivatives designated as hedges
Derivative asset designated as hedging instrument	5	4
Derivatives not designated as hedges
Derivative asset designated as hedging instrument	5	4
Derivative instruments not designated as hedging instruments, asset, at fair value	17	18
Other long-term assets [Member]
Derivatives designated as hedges
Derivative asset designated as hedging instrument	80	68
Derivatives not designated as hedges
Derivative asset designated as hedging instrument	80	68
Other current liabilities [Member]
Derivatives designated as hedges
Derivative liability designated as hedging instrument	7	16
Derivatives not designated as hedges
Derivative liability designated as hedging instrument	7	16
Derivative instruments not designated as hedging instruments, liability, at fair value	21	26
Other long-term liabilites [Member]
Derivatives designated as hedges
Derivative liability designated as hedging instrument	1	2
Derivatives not designated as hedges
Derivative liability designated as hedging instrument	1	2
Foreign currency exchange contracts (cash flow hedges) [Member]
Derivatives not designated as hedges
Notional amount	3,641	2,954
Period of derivatives not designated as hedges	12 months	12 months
Foreign currency exchange contracts (cash flow hedges) [Member] | Other current assets [Member]
Derivatives not designated as hedges
Derivative instruments not designated as hedging instruments, asset, at fair value	17	18
Foreign currency exchange contracts (cash flow hedges) [Member] | Other current liabilities [Member]
Derivatives not designated as hedges
Derivative instruments not designated as hedging instruments, liability, at fair value	14	14
Commodity contracts (cash flow hedges) [Member]
Derivatives not designated as hedges
Notional amount	46	61
Period of derivatives not designated as hedges	12 months	12 months
Commodity contracts (cash flow hedges) [Member] | Other current assets [Member]
Derivatives not designated as hedges
Derivative instruments not designated as hedging instruments, asset, at fair value	0	0
Commodity contracts (cash flow hedges) [Member] | Other current liabilities [Member]
Derivatives not designated as hedges
Derivative instruments not designated as hedging instruments, liability, at fair value	7	12
Fair Value Hedging [Member] | Fixed-to-floating interest rate swaps (fair value hedges) [Member]
Derivatives designated as hedges
Notional amount	1,290	940
Period of derivatives designated as hedges	1 to 22 years	1 to 22 years
Derivatives not designated as hedges
Period of derivatives designated as hedges	1 to 22 years	1 to 22 years
Fair Value Hedging [Member] | Fixed-to-floating interest rate swaps (fair value hedges) [Member] | Other current assets [Member]
Derivatives designated as hedges
Derivative asset designated as hedging instrument	0	0
Derivatives not designated as hedges
Derivative asset designated as hedging instrument	0	0
Fair Value Hedging [Member] | Fixed-to-floating interest rate swaps (fair value hedges) [Member] | Other long-term assets [Member]
Derivatives designated as hedges
Derivative asset designated as hedging instrument	80	68
Derivatives not designated as hedges
Derivative asset designated as hedging instrument	80	68
Fair Value Hedging [Member] | Fixed-to-floating interest rate swaps (fair value hedges) [Member] | Other current liabilities [Member]
Derivatives designated as hedges
Derivative liability designated as hedging instrument	0	0
Derivatives not designated as hedges
Derivative liability designated as hedging instrument	0	0
Fair Value Hedging [Member] | Fixed-to-floating interest rate swaps (fair value hedges) [Member] | Other long-term liabilites [Member]
Derivatives designated as hedges
Derivative liability designated as hedging instrument	0	2
Derivatives not designated as hedges
Derivative liability designated as hedging instrument	0	2
Fair Value Hedging [Member] | Interest Rate Contract Floating to Fixed Interest Rate Swap [Domain]
Derivatives designated as hedges
Notional amount	300
Period of derivatives designated as hedges	2 years	2 years
Derivatives not designated as hedges
Period of derivatives designated as hedges	2 years	2 years
Cash Flow Hedging [Member] | Interest Rate Contract Floating to Fixed Interest Rate Swap [Domain]
Derivatives designated as hedges
Notional amount		300
Cash Flow Hedging [Member] | Interest Rate Contract Floating to Fixed Interest Rate Swap [Domain] | Other current assets [Member]
Derivatives designated as hedges
Derivative asset designated as hedging instrument	0	0
Derivatives not designated as hedges
Derivative asset designated as hedging instrument	0	0
Cash Flow Hedging [Member] | Interest Rate Contract Floating to Fixed Interest Rate Swap [Domain] | Other long-term assets [Member]
Derivatives designated as hedges
Derivative asset designated as hedging instrument	0	0
Derivatives not designated as hedges
Derivative asset designated as hedging instrument	0	0
Cash Flow Hedging [Member] | Interest Rate Contract Floating to Fixed Interest Rate Swap [Domain] | Other current liabilities [Member]
Derivatives designated as hedges
Derivative liability designated as hedging instrument	0	0
Derivatives not designated as hedges
Derivative liability designated as hedging instrument	0	0
Cash Flow Hedging [Member] | Interest Rate Contract Floating to Fixed Interest Rate Swap [Domain] | Other long-term liabilites [Member]
Derivatives designated as hedges
Derivative liability designated as hedging instrument	1	0
Derivatives not designated as hedges
Derivative liability designated as hedging instrument	1	0
Cash Flow Hedging [Member] | Foreign currency exchange contracts (cash flow hedges) [Member]
Derivatives designated as hedges
Notional amount	417	308
Period of derivatives designated as hedges	12 to 36 months	12 to 36 months
Derivatives not designated as hedges
Period of derivatives designated as hedges	12 to 36 months	12 to 36 months
Cash Flow Hedging [Member] | Foreign currency exchange contracts (cash flow hedges) [Member] | Other current assets [Member]
Derivatives designated as hedges
Derivative asset designated as hedging instrument	5	4
Derivatives not designated as hedges
Derivative asset designated as hedging instrument	5	4
Cash Flow Hedging [Member] | Foreign currency exchange contracts (cash flow hedges) [Member] | Other long-term assets [Member]
Derivatives designated as hedges
Derivative asset designated as hedging instrument	0	0
Derivatives not designated as hedges
Derivative asset designated as hedging instrument	0	0
Cash Flow Hedging [Member] | Foreign currency exchange contracts (cash flow hedges) [Member] | Other current liabilities [Member]
Derivatives designated as hedges
Derivative liability designated as hedging instrument	3	9
Derivatives not designated as hedges
Derivative liability designated as hedging instrument	3	9
Cash Flow Hedging [Member] | Foreign currency exchange contracts (cash flow hedges) [Member] | Other long-term liabilites [Member]
Derivatives designated as hedges
Derivative liability designated as hedging instrument	0	0
Derivatives not designated as hedges
Derivative liability designated as hedging instrument	0	0
Cash Flow Hedging [Member] | Commodity contracts (cash flow hedges) [Member]
Derivatives designated as hedges
Notional amount	41	47
Period of derivatives designated as hedges	12 months	12 months
Derivatives not designated as hedges
Period of derivatives designated as hedges	12 months	12 months
Cash Flow Hedging [Member] | Commodity contracts (cash flow hedges) [Member] | Other current assets [Member]
Derivatives designated as hedges
Derivative asset designated as hedging instrument	0	0
Derivatives not designated as hedges
Derivative asset designated as hedging instrument	0	0
Cash Flow Hedging [Member] | Commodity contracts (cash flow hedges) [Member] | Other long-term assets [Member]
Derivatives designated as hedges
Derivative asset designated as hedging instrument	0	0
Derivatives not designated as hedges
Derivative asset designated as hedging instrument	0	0
Cash Flow Hedging [Member] | Commodity contracts (cash flow hedges) [Member] | Other current liabilities [Member]
Derivatives designated as hedges
Derivative liability designated as hedging instrument	4	7
Derivatives not designated as hedges
Derivative liability designated as hedging instrument	4	7
Cash Flow Hedging [Member] | Commodity contracts (cash flow hedges) [Member] | Other long-term liabilites [Member]
Derivatives designated as hedges
Derivative liability designated as hedging instrument	0	0
Derivatives not designated as hedges
Derivative liability designated as hedging instrument	$ 0	$ 0